Hi ADI Expert,
According to the datasheet page8 of LTC2500-32 Performance characteristics,
SNR: 116dB, SINAD:114dB @ 128K FFT, SSINC filter. thus I calculated the ENOB= SINAD 114dB -1.76dB/6.02 = 18.6 Bits.
The datasheet page32 table2 is noise performance at digital filter.
SSINC DF=4, noise is 6.97 uVrms
Thus I calculated the ENOB as blow.
ENOB=log2 (Fullscale 5Vx2 / 6.19uVrms)= 20.6 bits
Those ENOB performance has 2 bits gap between 18.6 and 20.6 bits, Is any thing wrong for my calculating?
The next question is if I used the best noise performance 0.15uVrms at SSINC filter DF 16384
Log2( FullScale 10V/0.15uV) = 25.99 ENOB
Noise-free resolution = Log2 (10V/0.15uVx6.6) = 23.2 Bits.
So this is the best performance for LT2500-32 32bit ADC, Am I right?
[edited by: RayW at 2:55 AM (GMT 0) on 26 May 2020]